On Tue, Apr 26, 2016 at 12:09 PM, Ali Rezaee <arv.ka...@gmail.com> wrote:
>
> Thanks for your replies.
> My objective is exactly what the code shows. I have a list of Boolean
> expressions similar to the examples in the code, and I need to evaluate them
> one by one based on x values.
> So writing a macro would be the only solution.
Just to be clear, a macro can't help here. You need to eval in global
scope if you want to evaluate arbitrary expressions.
>
> Best regards
>
> On Tuesday, April 26, 2016 at 5:38:21 PM UTC+2, Ali Rezaee wrote:
>>
>> Hi everyone,
>>
>> I am trying to run the code below. When I try the code outside of a
>> function and in REPL, it runs successfully. However when I run it using a
>> function it throw an error.
>> Why do I get the error? and how can I solve this problem?
>>
>> Thanks in advance for your help.
>>
>> rules = ["(x[1] && x[2])", "(x[3] || x[4])"]; # a list of boolean
>> expressions
>> boolList = [false, true, false, true]; # a boolean vector for every x in
>> rules
>>
>> function evaluate(rules, boolList)
>> x = boolList
>> result = Array{Bool}(length(rules))
>> for (i, rule) in enumerate(rules)
>> result[i] = eval(parse(rule))
>> end
>> return result
>> end
>>
>> evaluate(rules, boolList)
>> # ERROR: UndefVarError: x not defined
>>
>> # but This will work:
>> x = boolList
>> result = Array{Bool}(length(rules))
>> for (i, rule) in enumerate(rules)
>> result[i] = eval(parse(rule))
>> end
>>
>> result
>> # 2-element Array{Bool,1}: false true
>>
>>
>
